It is working with the Japanese version, at least. It has English + a couple of other languages. Saw it on a few private trackers as well.

Below are some additional background details on the Sonic Adventure 2 video game for those interested:

Sonic Adventure 2 is a platform video game developed by Sonic Team and initially published by Sega for the Dreamcast console, followed by a Nintendo GameCube port and high-definition versions for Microsoft's XBox Live Arcade and Sony's PlayStation Network.

Sonic Adventure 2 uses 3D graphics in addition to scrolling backgrounds. The game follows the same basic principles of previous games in the series. Within most stages are rings, which will protect the player from dying, so long as at least one is held by the player.

The Tails and Doctor Eggman stages are an exception, as they employ a health bar which is reloaded by gathering rings. Item capsules are also located within the stages, which provide the player bonuses.

Each character has obtainable power-ups which grant them new abilities, such as the ability to destroy metal boxes or play mystical melodies.